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iio: adc: ad799x: cache regulator voltages during probe

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Since the reference voltage for this ADC is not expected to
change at runtime, determine the active reference voltage (either VREF
or VCC) during probe() and cache it in a single variable in the state
structure.

Suggested-by: Jonathan Cameron <jic23@kernel.org>
Suggested-by: David Lechner <dlechner@baylibre.com>
Reviewed-by: David Lechner <dlechner@baylibre.com>
Signed-off-by: Archit Anant <architanant5@gmail.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@intel.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Archit Anant 2026-04-12 15:07:38 +05:30 committed by Jonathan Cameron
parent 21450969a7
commit 97c3fae0db
1 changed files with 16 additions and 8 deletions
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24
drivers/iio/adc/ad799x.c
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@ -30,6 +30,7 @@
#include <linux/slab.h>
#include <linux/sysfs.h>
#include <linux/types.h>
#include <linux/units.h>
#include <linux/iio/buffer.h>
#include <linux/iio/events.h>
@ -135,6 +136,9 @@ struct ad799x_state {
u16 config;
unsigned int transfer_size;
int vref_uV;
IIO_DECLARE_BUFFER_WITH_TS(__be16, rx_buf, AD799X_MAX_CHANNELS);
};
@ -303,14 +307,7 @@ static int ad799x_read_raw(struct iio_dev *indio_dev,
GENMASK(chan->scan_type.realbits - 1, 0);
return IIO_VAL_INT;
case IIO_CHAN_INFO_SCALE:
if (st->vref)
ret = regulator_get_voltage(st->vref);
else
ret = regulator_get_voltage(st->reg);
if (ret < 0)
return ret;
*val = ret / 1000;
*val = st->vref_uV / (MICRO / MILLI);
*val2 = chan->scan_type.realbits;
return IIO_VAL_FRACTIONAL_LOG2;
}
@ -829,9 +826,20 @@ static int ad799x_probe(struct i2c_client *client)
ret = regulator_enable(st->vref);
if (ret)
goto error_disable_reg;
ret = regulator_get_voltage(st->vref);
if (ret < 0)
goto error_disable_vref;
st->vref_uV = ret;
}
}
if (!st->vref) {
ret = regulator_get_voltage(st->reg);
if (ret < 0)
goto error_disable_reg;
st->vref_uV = ret;
}
st->client = client;
indio_dev->name = id->name;